guess.

Its difficult for a hypersonic vehicle to turn around and return to base. So it'll probably circumnavigate the earth after a long range mission. It will glide most of the time and switch on the engine only after the speed drops to a certain level.It'll be a big craft to carry enuff fuel(to hop a number of times)and weapons.

(the bigger the craft,the longer the range given the same tech level and similar config)